The Mission Life was stated as one lunar daylight period (14 earth days) well before the launch. You can see this in the Wikipedia article [1] and in the citati

The Mission Life was stated as one lunar daylight period (14 earth days) well before the launch. You can see this in the Wikipedia article [1] and in the citation for it. So yes, it was stated beforehand. [1]: https://en.m.wikipedia.org/wiki/Chandrayaan-3 https://en.m.wikipedia.org/wiki/Chandrayaan-3